func showAlert () {
let alertDialog = UIAlertController(title: "タイトル",
message: "メッセージが入ります",
preferredStyle: UIAlertControllerStyle.alert)
let button = UIAlertAction(title: "ボタンタイトル",
style: UIAlertActionStyle.default) { (action) in
//ここにボタンが押された時のアクションの処理を書く
}
alertDialog.addAction(button)
present(alertDialog, animated: true, completion: nil)
}
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